Cellulosic spinning solutions containing aromatic silicon derivatives



Patented Feb. 11, 1936 CELLULOSIC SPINNING SOLUTIONS CON- TAININGAROMATIC SILICON DERIVA- TIVES Rudolph S. Bley, Elizabethton, Tenn.,assig'nor to North American Rayon Corporation, New York, N. Y., acorporation of Delaware N Drawing.

10 Claims.

The present invention relates to a process of preparing cellulosicspinning solutions from which soft-lustre products, such as filaments,

yarns, ribbons, films, etc., may be produced. The primary object of myinvention has to do with the incorporation of aromatic siliconderivatives into cellulosic spinning solutions, which will yield, uponextrusion or molding, soft-lustre products of pleasing hand.

Another object of my invention has to do with the admixture ofphenyl-silicon derivatives with viscose and cuprammonium cellulosesolutions.

A third object of the present invention has to do with the incorporationof tolyl-silicon derivatives into viscose and cuprammonium cellulosesolutions.

A fourth object of this invention has to do with the incorporation ofbenzyl-silicon derivatives into the aforementioned cellulosic solutions.

A fifth object of this invention relates to the manufacture of novel,soft-lustre products per se containing aromatic silicon derivatives.

Other objects of my invention will become apparent to those skilled inthe art after a study of the following specification.

In the early days of rayon manufacture, the demand was entirely foryarns having the highest degree of lustre. Later, when it was found thathighly lustrous rayon too clearly indicated its origin-an artificialfibre-a demand arose for artificial silk which more closely approximatedto natural silk. The earliest attempt to meet the demand of dull-lustreviscose, for example, was a method of retaining sulphur particles in the35 fibres by discontinuing the normal desulphurizing step during itsmanufacture. Although this yarn showed decreased lustre, due toscattering of light by the sulphur particles, it was impermanent andexhibited an unattractive "bloom. has been improved by dispersing,instead of sulphur, fine inorganic or organic particles and globules incellulosic spinning solutions, for example, pigments, hydrocarbons;oils, etc. When inorganic compounds, such as titanium dioxide, silica,etc., are dispered in cellulosic spinning solutions, they tend to cutthe thread guides through which they are led during the extrusionprocess, and in addition, they weaken the cellulosic yarns.Hydrocarbons, emulsified with spinning solutions to deluster cellulosicproducts obtained therefrom, have the great disadvantage of beinginflammable, while vegetable oils become rancid and form skin-irritatingacids. 1

I have, unexpectedly, found, that aromatic silicon derivatives possessproperties which render This method Application October 22, 1934, SerialNo. 749,486

them especially suitable as delustering agents for rayon products, sincethey are practically fire-resistant and do not form irritatingdecomposition products. The following table depicts a number of suchderivatives of silicon which may be used in combination with viscose andcuprammonium cellulose solutions.

Phenylsilicon triethyl-ether (CizHzosiOa) Silico-benzoic acid(CsH5.Si(OC2H5) 3) Triethyl-phenyl silicon (CeH5.Si(C2H5) 3)Triethyl-phenyl-silicon chloride (C12H10C12Si) Silicon-triphenylchloride (CiaH15SiC1) Silicon tetraphenyl (C24H20Si)Trisilico-benzoyl-silicic acid (C1sH1aSi4O'z)Silico-tetranitro-tetraphenyl (C24H1sN4SiOa) Silico-di-o-diphenylene(C12H8Si) Silicon tetrabenzyl (CzaHzsSi) P-silicotolyl chloride(C'lH'lSiClIi) Silicotolyl acid (C7HsSiO2) Silicon tetratolyl (CzsHzaSi)and other carbo-and heterocyclic silicon compounds.

Ill.

, Example About 1 to 20% of an aromatic silicon derivative, for example,triethyl-phenyl silicon, is dispersed in and/or emulsified with acellulosic spinning solution, such as viscose and cuprammoniumcellulose, the aforementioned percentages being based upon the cellulosecontent of the solution. After uniformly distributing the delusteringagent in the spinning solution, it is extruded through suitable spinningnozzles into a conventional spinning bath. Organic solvents, 3ainorganic or organic pigments, etc., may be added to the spinningsolutions in addition to the silicon compounds. The amounts of thesearomatic silicon derivatives, to be added to the cellulosic solutions,may be varied at will. In this manner, more or less delustered rayonproducts may be obtained.

Modifications of my process will readily be recognized by those skilledin the art, and I desire to include all those modifications fallingwithin the scope of the appended claims. In these claims, the termaromatic silicon compound is limited to such compounds which aresubstantially water-insoluble and resistant to attack by acids andalkalis of such concentrations convntionally used in the rayon art.

I claim:

1. A spinning solution for the manufacture of soft-lustre productscomprising a solution of the group consisting of viscose andcuprammonium cellulose together with a phenyl-silicon derivative, saidderivative being stable in said spinning solution.

2. A spinning solution for the manufacture of soft-lustre productscomprising a solution of the group consisting of viscose andcuprammonium cellulose and a triethyl-phenyl silicon, saidtriethyl-phenyl silicon being stable in said spinning solution.

3. As a new article of manufacture, regenerated cellulose containing afinely dispersed. phenyl derivative of silicon.

4. As a new article of manufacture, regenerated cellulose containing asmall amount of a triethyl-phenyl silicon.

5. A spinning solution for the manufacture of soft-lustre productscomprising a solution of the group consisting of viscose andcuprammonium cellulose together with a substance of the group consistingof phenyl-silicon derivatives, tolylsilicon derivatives andbenzyl-silicon derivatives, said substance being stable in saidsolution.

6. A spinning solution for the manufacture of soft-lustre productscomprising a solution of the group consisting of viscose andcuprammonium cellulose together with a benzyl-silicon derivative, saidderivative being stable in said solution.

7. A spirming solution for the manufacture of 5 soft-lustre productscomprising a solution of the group consisting of viscose andcuprammonium cellulose together with a tolyl-silicon derivative, saidderivative being stable in said solution.

8. As a new article of manufacture, regenerated 1 cellulose containing asubstance of the group consisting of phenyl-silicon derivatives,tolyl-silicon derivatives and benzyl-silicon derivatives, said substancebeing finely dispersed throughout said cellulose. 15

9. As a new article of manufacture. regenerated cellulose containing afinely dispersed tolyl-silicon derivative.

10. As a new article of manufacture, regenerated cellulose containing afinely dispersed benzyl- 20 silicon derivative.

RUDOLPH S. BLEY.

